Stay or go? Some towns are eyeing retreat from sea

In this photo from Thursday, May 24, 2012, a man and woman walk in the parking lot at Ocean Beach in San Francisco. In San Francisco, officials are mulling a significant retreat on its western flank, where the Great Highway is under assault from the Pacific Ocean. Right now, a beach parking lot that abuts the highway is crumbing into the sea just across the highway from the San Francisco Zoo. (AP Photo/Jeff Chiu)

Associated Press

Summary

Years of ferocious storms have threatened to gnaw away the western tip of a popular beachfront park two hours drive north of Los Angeles. Instead of building a 500-foot-long wooden defense next to the pier to tame the tide, the latest thinking is to flee.

LOS ANGELES (AP) — Years of ferocious storms have threatened to gnaw away the western tip of a popular beachfront park two hours drive north of Los Angeles. Instead of building a 500-foot-long wooden defense next to the pier to tame the tide, the latest thinking is to flee.

Work is under way to gauge the toll of ripping up parking lots on the highly eroded west end of Goleta Beach County Park and moving a scenic bike path and buried utility lines inland away from lapping waves.

Up and down the California coast, some communities are deciding it's not worth trying to wall off the encroaching ocean. Until recently, the thought of bowing to nature was almost unheard of.

But after futile attempts to curb coastal erosion — a problem expected to grow worse with rising seas fueled by global warming — there is growing acknowledgment that the sea is relentless and any line drawn in the sand is likely to eventually wash over.

"I like to think of it as getting out of the way gracefully," said David Revell, a senior coastal scientist at ESA PWA, a San Francisco-based environmental consulting firm involved in Goleta and other planned retreat projects.

The issue of whether to stay or flee is being confronted around the globe. Places experimenting with retreat have adopted various strategies. In Britain, for example, several sites along the Essex coast have deliberately breached seawalls to create salt marshes, which act as a natural barrier to flooding.

In the U.S., the starkest example can be found in Alaska, where entire villages have been forced to move to higher ground or are thinking about it in the face of melting sea ice. Hawaii's famous beaches are slowly shrinking and some scientists think it's a matter of time before the state has to explore whether to move back development.

Several states along the Atlantic coast have adopted policies meant to keep a distance from the ocean. They include no-build zones, setbacks or rolling easements that allow development but with a caveat. As the sea advances, homeowners promise not to build seawalls and must either shift inland or let go.

Over the past half-century, the weapon of choice against a shrinking shoreline has been building a seawall or other defense. Roughly 10 percent of California's 1,100-mile coast is armored. In Southern California, where development is sometimes built steps from the ocean, a third of the shore is dotted with man-made barriers.

While such buffers may protect the base of cliffs, and the land and property behind them, they often exacerbate the problem by scouring beaches, making them narrower or even causing them to disappear.

This is one reason state coastal regulators in 2009 turned down a proposal by Santa Barbara County to fortify an eroding section of Goleta Beach park lashed by periodic storms. A rock wall was built as a temporary stopgap, but a long-term solution was needed. After the state rejected the construction of another hard structure, park officials, working with environmentalists, came up with a Plan B: Move gas, water and sewer lines out of the risk zone. Relocate a bike path to higher ground. Demolish 150 parking spaces and allow the acre of asphalt to be reclaimed by the beach.

Last month, the county Board of Supervisors gave the go-ahead for an environmental review. Work could begin next year if the $4 million plan passes other regulatory hurdles.

Around California, relocation of coastal infrastructure and development is being pushed by the Surfrider Foundation and other environmental groups. But the efforts also are being driven by increased awareness of climate change. Sea level has risen by 7 inches over the last century in California. By 2050, it's projected to rise between 12 to 18 inches.

Popular Comments

Mother nature is relentlesly washing the land into the oceans. Thus the ocean
level naturally rises. The only solution would be to dam every river before it
flows into the ocean, thereby trapping all the silt. Even this would only be a
temporary
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6:19 a.m. June 3, 2012

Top comment

Allisdair

Thornbury, Vic

Whether you beleive it is man made or not the climate is changing the World is
getting hotter. The evidence is solid. The increased heat in the ocean means
the water is expanding. The ice shelfs and glaciers are melting. The result is
increased
More..